* {
    padding: 0;
    margin: 0;
}
.main-body {
    width: 350px;
    height: 370px;
    border: 1px solid #e3e3e3;
    position:absolute;
    left:50%;
    top:50%;
    margin-left:-175px;
    margin-top:-215px;
}
.main-body .title {
    font-size: 32px;
    margin: 20px 0;
    text-align: center;
}
